Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
cáca
←
Proto-Germanic
*kakǭ
(derived)
←
Proto-Indo-European
*gog
(derived)
←
Middle Irish
cáca
(inherited)
←
Old Norse
kaka
(derived)
→
Irish
cáicín
(affix)